Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc2f8027de4e198…

MALICIOUS

PDF

81.0 KB Created: 2021-03-22 13:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91b94eaf942e3d17ff0a8858b192b195 SHA-1: d272e62dd29b6aec6a541b82a261e8d7ab0afea0 SHA-256: 2fc2f8027de4e1988a570fc8def809624a2f87503bd7326ba22a49d7f1e5f5e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, including one pointing to "kuzutuzo.ru", suggests a link farm or phishing attempt. The ML classifier output of 0.994992 further supports the malicious classification. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/aws?utm_term=roll20+how+to+change+avatar+picture
    • https://cdn-cms.f-static.net/uploads/4503767/normal_603aec4f45959.pdf
    • http://testertumentum.space/102382683483k8qf.pdf
    • https://static.s123-cdn-static.com/uploads/4383322/normal_600180108e2bb.pdf
    • https://static.s123-cdn-static.com/uploads/4409796/normal_5fec1d5bd69ae.pdf
    • http://amaryllis.space/sowubarodexunodujaforuves5kthm.pdf
    • http://rowowesofazov.medianewsonline.com/administrao_de_pequenas_empresas.pdf
    • https://static.s123-cdn-static.com/uploads/4494674/normal_5ff90c4680c4d.pdf
    • http://atomyimperial.ru/zosanirowoakvni.pdf
    • http://mosquito.codes/kinety1nvu.pdf
    • http://biniwitovo.mywebcommunity.org/jojisunepamabenifenutiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d50b9549ff1f4285a1d6ae1bc5109c93.pdf?index=true
    • http://wojibikifi.myartsonline.com/things_to_buy_for_new_house_checklist.pdf
    • https://a9d1d3ec-13fa-4b7e-abe1-abe2c2ba1301.filesusr.com/ugd/f83029_bf5cb37376d4462f9c2263fc9b017833.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_b37105fce1414c23a6ca42d6acbe2f1e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6c6bd55f-037b-4481-a423-668a4c7bb9a5/basagenerenadoxoxirel.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_faa199b0bd244a2ca673a2e0225ce631.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12839f80-6117-4cbb-939a-e63094091ba5/how_to_connect_jensen_bluetooth_speaker_to_iphone.pdf
    • https://uploads.strikinglycdn.com/files/6b635e6b-f866-4025-92cb-d8f9a7f07ebc/63303788603.pdf
    • https://uploads.strikinglycdn.com/files/5fbba4e6-0a3b-416d-8725-1038fad53af9/90033044563.pdf
    • http://wufagezigedo.onlinewebshop.net/69800431038.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_ed2a6cd76a8248f1a06a6a1db3a4e952.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_e5edc01caec742a6975779a5d12e4980.pdf?index=true
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_eeefe00ce99f4aa0b6baab09c0fa7cbe.pdf?index=true
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_41eba3b4f5874d23bb42e2d591bead18.pdf?index=true
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_0605f0b45527452288544b5696aad6ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8422daa2-6fe2-48a9-91bb-9fab88b906b7/40774694228.pdf
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_59ebec4172ae4679bb2e227f37ca0de0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ba.bin
8fe238d4efa118d1e805f072976fe3c461391de55fefcb4facfc8f71fb735506		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 3016 bytes
font_01_sfnt_off0000fc75.bin
a9fb5cf4d85541cdfacd639465cbf89357080b94072b7f90de2d1c12978da6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 5448 bytes
font_02_sfnt_off00010f18.bin
541f139085dfe6cde95a3351ae89c95f3e3038232b7bd45794fa31056fc5df22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 11532 bytes

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